Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.5194/acp-17-3317-2017 |
Multiresolution analysis of the spatiotemporal variability in global radiation observed by a dense network of 99 pyranometers | |
Madhavan, Bomidi Lakshmi1,2; Deneke, Hartwig1; Witthuhn, Jonas1; Macke, Andreas1 | |
2017-03-08 | |
发表期刊 | ATMOSPHERIC CHEMISTRY AND PHYSICS |
ISSN | 1680-7316 |
EISSN | 1680-7324 |
出版年 | 2017 |
卷号 | 17期号:5 |
文章类型 | Article |
语种 | 英语 |
国家 | Germany; India |
英文摘要 | The time series of global radiation observed by a dense network of 99 autonomous pyranometers during the HOPE campaign around Julich, Germany, are investigated with a multiresolution analysis based on the maximum overlap discrete wavelet transform and the Haar wavelet. For different sky conditions, typical wavelet power spectra are calculated to quantify the timescale dependence of variability in global transmittance. Distinctly higher variability is observed at all frequencies in the power spectra of global transmittance under broken-cloud conditions compared to clear, cirrus, or overcast skies. The spatial autocorrelation function including its frequency dependence is determined to quantify the degree of similarity of two time series measurements as a function of their spatial separation. Distances ranging from 100m to 10 km are considered, and a rapid decrease of the autocorrelation function is found with increasing frequency and distance. For frequencies above 1/3 min(-1) and points separated by more than 1 km, variations in transmittance become completely uncorrelated. A method is introduced to estimate the deviation between a point measurement and a spatially averaged value for a surrounding domain, which takes into account domain size and averaging period, and is used to explore the representativeness of a single pyranometer observation for its surrounding region. Two distinct mechanisms are identified, which limit the representativeness; on the one hand, spatial averaging reduces variability and thus modifies the shape of the power spectrum. On the other hand, the correlation of variations of the spatially averaged field and a point measurement decreases rapidly with increasing temporal frequency. For a grid box of 10 km x 10 km and averaging periods of 1.5-3 h, the deviation of global transmittance between a point measurement and an area-averaged value depends on the prevailing sky conditions: 2.8 (clear), 1.8 (cirrus), 1.5 (overcast), and 4.2% (broken clouds). The solar global radiation observed at a single station is found to deviate from the spatial average by as much as 14-23 (clear), 8-26 (cirrus), 4-23 (overcast), and 31-79 W m(-2) (broken clouds) from domain averages ranging from 1 km x 1 km to 10 km x 10 km in area. |
领域 | 地球科学 |
收录类别 | SCI-E |
WOS记录号 | WOS:000396203000001 |
WOS关键词 | LIQUID WATER PATH ; SOLAR IRRADIANCE ; CLOUD INHOMOGENEITY ; OPTICAL DEPTH ; SATELLITE ; VALIDATION ; RETRIEVALS ; METEOSAT ; FIELDS ; FLUXES |
WOS类目 | Environmental Sciences ; Meteorology & Atmospheric Sciences |
WOS研究方向 | Environmental Sciences & Ecology ; Meteorology & Atmospheric Sciences |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/16224 |
专题 | 地球科学 |
作者单位 | 1.Leibniz Inst Tropospher Res TROPOS, Permoserstr 15, D-04318 Leipzig, Germany; 2.Goa Univ, Dept Marine Sci, Goa 403206, India |
推荐引用方式 GB/T 7714 | Madhavan, Bomidi Lakshmi,Deneke, Hartwig,Witthuhn, Jonas,et al. Multiresolution analysis of the spatiotemporal variability in global radiation observed by a dense network of 99 pyranometers[J]. ATMOSPHERIC CHEMISTRY AND PHYSICS,2017,17(5). |
APA | Madhavan, Bomidi Lakshmi,Deneke, Hartwig,Witthuhn, Jonas,&Macke, Andreas.(2017).Multiresolution analysis of the spatiotemporal variability in global radiation observed by a dense network of 99 pyranometers.ATMOSPHERIC CHEMISTRY AND PHYSICS,17(5). |
MLA | Madhavan, Bomidi Lakshmi,et al."Multiresolution analysis of the spatiotemporal variability in global radiation observed by a dense network of 99 pyranometers".ATMOSPHERIC CHEMISTRY AND PHYSICS 17.5(2017). |
条目包含的文件 | 条目无相关文件。 |
除非特别说明,本系统中所有内容都受版权保护,并保留所有权利。
修改评论